HAL525 Просмотр технического описания (PDF) - Unspecified

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HAL525

Hall Effect Sensor IC

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HAL525, HAL535

Hall Effect Sensor Family

Release Note: Revision bars indicate significant

changes to the previous edition.

1. Introduction

The HAL525 and HAL535 are Hall switches produced

in CMOS technology. The sensors include a tempera-

ture-compensated Hall plate with active offset com-

pensation, a comparator, and an open-drain output

transistor. The comparator compares the actual mag-

netic flux through the Hall plate (Hall voltage) with the

fixed reference values (switching points). Accordingly,

the output transistor is switched on or off.

The active offset compensation leads to magnetic

parameters which are robust against mechanical

stress effects. In addition, the magnetic characteristics

are constant in the full supply voltage and temperature

range.

The sensors are designed for industrial and automo-

tive applications and operate with supply voltages

from 3.8 V to 24 V in the ambient temperature range

from −40 °C up to 150 °C.

The HAL525 and HAL535 are available in the

SMD-package SOT-89B and in the leaded version

TO-92UA.

1.2. Family Overview

Both sensors have a latching behavior with typically

the same sensitivity. The difference between HAL 525

and HAL535 is the temperature coefficient of the mag-

netic switching points.

Type Switching

Behavior

525 latching

535 latching

Typical

Temperature

Coefficient

−2000 ppm/K

−1000 ppm/K

see

Page

14

16

Latching Sensors:

Both sensors have a latching behavior and requires a

magnetic north and south pole for correct functioning.

The output turns low with the magnetic south pole on

the branded side of the package and turns high with

the magnetic north pole on the branded side. The out-

put does not change if the magnetic field is removed.

For changing the output state, the opposite magnetic

field polarity must be applied.

1.1. Features

– switching offset compensation at typically 115 kHz

– operates from 3.8 V to 24 V supply voltage

– operates with static magnetic fields and dynamic

magnetic fields up to 10 kHz

– overvoltage protection at all pins

– reverse-voltage protection at VDD-pin

– magnetic characteristics are robust against

mechanical stress effects

– short-circuit protected open-drain output by thermal

shut down

– constant switching points over a wide supply voltage

range

– the decrease of magnetic flux density caused by ris-

ing temperature in the sensor system is compen-

sated by a built-in negative temperature coefficient

of the magnetic characteristics

– ideal sensor for window lifter, ignition timing, and

revolution counting in extreme automotive and

industrial environments

– EMC corresponding to DIN 40839

Micronas

3

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